What is the speed of light in a vacuum?

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Multiple Choice

What is the speed of light in a vacuum?

Explanation:
Light in a vacuum moves at a universal speed: about 3.0 x 10^8 meters per second. This value, called c, is the same for all observers and sets a fundamental speed limit in the universe. Because c is so central to how space and time relate, the meter itself is defined in terms of this exact speed, making 299,792,458 m/s the precise value and 3.0 x 10^8 m/s a common rounded figure. The other numbers don’t fit because they represent speeds that are either much slower or much faster than this universal constant, which isn’t possible for light traveling through empty space.

Light in a vacuum moves at a universal speed: about 3.0 x 10^8 meters per second. This value, called c, is the same for all observers and sets a fundamental speed limit in the universe. Because c is so central to how space and time relate, the meter itself is defined in terms of this exact speed, making 299,792,458 m/s the precise value and 3.0 x 10^8 m/s a common rounded figure. The other numbers don’t fit because they represent speeds that are either much slower or much faster than this universal constant, which isn’t possible for light traveling through empty space.

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